Shear strength model of reinforced and prestressed concrete beams with and without stirrup used in the CIS countries

Abstract

SNiP code is widely used in the so-called post-soviet union or commonwealth of independent states (CIS) countries for the structural designs of reinforced and prestressed concrete structures, and this study aims to present modification factors of the existing shear design equation for the concrete contribution specified in SNiP code. The existing shear strength estimation model specified in SNiP code was initially developed about 90 years ago based on a semi-empirical approach, which means its accuracy and margin of safety level depends significantly on the shear test results available at that time. In this study, a rational modification factor is derived to improve the accuracy of the shear design equation in SNiP code using a current up-to-date large shear database, and the key influencing factors of the shear resistance of beam members, such as the longitudinal reinforcement ratio and presttressing effect, were addressed. To verify the accuracy and safety level of the proposed models, detailed verifications are introduced with comparisons to the other design models used in the international building codes.